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Ni coated SiO2 and SiO2 coated Ni composite particles with core-shellstructures were designed, prepared and their microwave absorption propertieswere characterized. The comparison study of the shell effect on the effectiveelectromagnetic parameters reveals that the effective permittivity/permeabilitywas crucially determined by the percent and the intrinsic electromagneticparameters of the component materials regardless of various core/shellstructures. Both of the composite core-shell structures could have goodmicrowave absorption properties. Investigation of the input impedance indicatesthat, good microwave absorption performances are a consequence of properelectromagnetic impedance matches when the effective electromagnetic parameterswere modulated.

Comparative study of microwave absorption in Ni/SiO2 and SiO2/Ni core-shell structures